气候变化领域集成服务门户(CCPortal): Chemical composition and seasonal variations of PM2.5 in an urban environment in Kunming, SW China: Importance of prevailing westerlies in cold season

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DOI	10.1016/j.atmosenv.2020.117704
	Chemical composition and seasonal variations of PM2.5 in an urban environment in Kunming, SW China: Importance of prevailing westerlies in cold season
	Zhou Y.; Xiao H.; Guan H.; Zheng N.; Zhang Z.; Tian J.; Qu L.; Zhao J.; Xiao H.
发表日期	2020
ISSN	13522310
卷号	237
英文摘要	Kunming, a Chinese southwestern tourist city which has not large local pollution sources, has found to have an increasing tendency of haze pollution in recent years. But the pollution sources are unclear. In order to identify them, daily PM2.5 samples (n = 346) were collected from September 2017 to August 2018 in the urban area. And the major water-soluble inorganic ions (WSIIs) were determined to better understand the chemical characteristics, source categories and potential region of sources. Our study showed that the mass concentration of PM2.5 in Kunming ranged from 7.61 to 91.83 μg m−3, with an annual average value of 33.59 ± 15.71 μg m−3. Positive matrix factorization (PMF) model identified five factors including secondary aerosol (the contributions of 36.3%), coal combustion (26.0%), biomass burning (19.2%), dust (12.5%) and sea salt (6.0%). And coal combustion played a leading role in the source contribution of PM2.5 in winter while biomass combustion was dominant in spring. Being located between two severe haze zones in the world, northern-central China and north of South Asia, and affected by India monsoon and East Asia monsoon in summer and prevailing westerlies in winter, we found that air masses from South Asia (especially India) contained pollutants could be brought to Kunming by prevailing westerlies in winter. In spring, however, the sources of PM2.5 in Kunming were mainly affected by biomass burning from South Asia and Southeast Asia when prevailing westerlies gradually weakened. © 2020 Elsevier Ltd
英文关键词	Back trajectory; PM2.5; Positive matrix factorization; Prevailing westerlies; Water-soluble inorganic ions
语种	英语
scopus关键词	Atmospheric thermodynamics; Biomass; Coal dust; Factorization; Pollution; Chemical characteristic; Chemical compositions; Positive matrix factorization models; Seasonal variation; Secondary aerosols; Source contributions; Urban environments; Water soluble inorganic ions; Coal combustion; coal; ion; aerosol; biomass burning; coal combustion; particulate matter; sea salt; seasonal variation; urban area; westerly; air pollutant; air pollution; Article; biomass; chemical composition; China; combustion; haze; India; particulate matter; priority journal; rainy season; seasonal variation; spring; summer; urban area; winter; China; Kunming; South Asia; Yunnan
来源期刊	Atmospheric Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153015
作者单位	State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Key Laboratory of the Causes and Control of Atmospheric Pollution, East China University of Technology, Nanchang, 330000, China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
推荐引用方式 GB/T 7714	Zhou Y.,Xiao H.,Guan H.,et al. Chemical composition and seasonal variations of PM2.5 in an urban environment in Kunming, SW China: Importance of prevailing westerlies in cold season[J],2020,237.
APA	Zhou Y..,Xiao H..,Guan H..,Zheng N..,Zhang Z..,...&Xiao H..(2020).Chemical composition and seasonal variations of PM2.5 in an urban environment in Kunming, SW China: Importance of prevailing westerlies in cold season.Atmospheric Environment,237.
MLA	Zhou Y.,et al."Chemical composition and seasonal variations of PM2.5 in an urban environment in Kunming, SW China: Importance of prevailing westerlies in cold season".Atmospheric Environment 237(2020).